20343131 has 8 divisors (see below), whose sum is σ = 20643504. Its totient is φ = 20044800.

The previous prime is 20343097. The next prime is 20343137. The reversal of 20343131 is 13134302.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20343131 is a prime.

It is a super-2 number, since 2×20343131² = 827685957766322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20343137) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38636 + ... + 39158.

It is an arithmetic number, because the mean of its divisors is an integer number (2580438).

Almost surely, 2^20343131 is an apocalyptic number.

20343131 is a deficient number, since it is larger than the sum of its proper divisors (300373).

20343131 is an equidigital number, since it uses as much as digits as its factorization.

20343131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1021.

The product of its (nonzero) digits is 216, while the sum is 17.

The square root of 20343131 is about 4510.3360185246. The cubic root of 20343131 is about 272.9853024688.

Adding to 20343131 its reverse (13134302), we get a palindrome (33477433).

It can be divided in two parts, 203 and 43131, that added together give a palindrome (43334).

The spelling of 20343131 in words is "twenty million, three hundred forty-three thousand, one hundred thirty-one".